If you're one who is familiar with the human anatomy, coxal obviously means that part of the body pertaining to the the... hip. Isn't that weird? If you are not familiar with the terms of human anatomy then you will probably be of the mistaken opinion that the term coxal refers to the male cock, or, in other words, the penis.

Mark: Coxal!
Sarah: Don't be an ignorant pig. I know that means pertaining to the hip. Wanker.